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From: Julian Elischer <julian@elischer.org>
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Subject: lock contention etc.
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here's an intersting set of numbers..

notice the increase in 'system time' for the same work done when  there
is more parallelism.

make buildworld
     3762.94 real      2627.66 user      1275.78 sys
     3763.32 real      2632.04 user      1271.80 sys
     3763.34 real      2627.99 user      1276.39 sys
     3763.03 real      2632.50 user      1270.91 sys

make -j 2 buildworld
     2465.10 real      2958.94 user      1918.64 sys
     2463.97 real      2968.43 user      1910.65 sys
     2472.13 real      2978.64 user      1912.80 sys
     2582.83 real      2965.51 user      2047.19 sys

make -j 4 buildworld
     2262.88 real      4322.31 user      3333.58 sys
     2255.88 real      4330.32 user      3319.48 sys
     2256.09 real      4318.84 user      3336.57 sys
     2257.63 real      4338.34 user      3313.07 sys

(2 processors with HTT)  (looks like 4 processors)
-current, sched_4bsd

I'm guessing that the extra system time represents a lot of
contention somewhere.

What is the best way to get actual numbers on this?